AVer EVC900 - Manual (Page 67)

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STUN Server
STUN (Session Traversal Utilities for NAT) is a
standardized set of methods and a network
protocol to allow an end host to discover its
public IP address if it is located behind a NAT.
Enter IP address of SIP NAT traversal server.
STUN Port
Enter port number of STUN server.
Enable STUN Server
Mark to enable STUN server function.